Litter bin



FIG. 1 is a top and front perspective view of a litter bin showing my new design;

FIG. 2 is a right side elevational view thereof, the left side view being a mirror image of that shown;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof.

The undisclosed bottom is flat and unornamented. 

The ornamental design for a litter bin, as shown and described. 